Timing gear



l `MMM/M//M/W//W//W/////// oct, 19, 1926. 1,604,105 C. L. STARKEY TIMINGGEAR Filed May 1, 1924 2 Sheets-Sheet l fav 5//////////////M//M/W////////////////////ii)5 TMING GEAR 2 sheetsmm 2FiledMay 1, 1924 CLARE/WEI. -STA @KEY Patented Oct. 19, 1926.

UNITED sT Ares* P 1,604,105l ATENT OFFICE. l

CLARENCE L. STARKEY, OF FRESNO, CALIFORNIA.

. TIMING GEAR.

Application filed May 1,

novino` sound andvalso rendering the timinv" e 23 b b uncertain. Inorder to remedy this defect it has been necessary to either set thegears tightly together, causing excessive friction, or else to renew thegears frequently.

It is the object of my invention to provide a timing gear equipped withsuitable means for automatically maintaining the proper tension betweenthe timing gears to hold the same in proper operative engagement,thereby eliminating backlash and the unpleasant noises incidentalthereto.

Other objects and advantages Will appear hereinafter and, While I haveshown and Will describe the preferred form of my in vention, I wish itunderstood that I do not limit myself to such preferred form, but thatvarious changes and adaptations may be made therein Without departingfrom the spirit of my invention.

In the drawings accompanying and forming a part hereof:

Fig. 1 is a side elevation, partly broken away, of one of my timinggears in its inoperative position.

Fig. 2 is a central horizontal section of Fig. 1.

Fig. 3 is a top plan of Fig. 1.

I Fig. 4 is a central vertical section of Fig. 5 is a view similar toFig. 1, showing my device in its operative position.

Fig. 6 is a side elevation, on a reduced scale, of my device equippedfor a chain drive.

Referring to the drawings, my device comprises a disc 10 provided aroundits outer periphery With gear teeth 1l.. Projecting from one side ofdisc 10, concentric and preferably integral therewith, is a hub 12, andrevolubly mounted upon the outer periphery of this hub is a ring 13, theouter periphery of which ring is provided with gear teeth 14 whichcoincide with gear teeth 11 on disc 10 and form a continuation thereof.Provided in the inner periphery of ring 18, in opposed relation, arerecesses 15 and 16. Recesses 15 and 16 are substantially of theconfiguration of ratchet teeth, the square 1924. serial No. 710,246.

ends 17 and 18 of which are engaged by the noses 19 of paivls 20. PaWls2O are pivotally mounted within recesses 21 and 22 formed in hub 12, bymeans of pintle bolts 23. The

free ends of pavvls 2O are connected to one end of coil springs 25, theother ends of which are rigidly mounted upon studs 26 extendingoutwardly from the inner face of recesses 21 `and 22. A disc 27,provided around its outer periphery with gear teeth 2S, similar to teeth11 and 141 and coinciding with and forming a continuation thereof, isrigidly secured to member 10 by means of bolts 29, whereby members 1()and 27 are rigidly secured together to move in unison, While ring 13 ismounted rotatably therebetiveen. An aperture 30 projects centrallythrough members 12 and 27 for the reception of the usual shaft.

In F ig. 6 I have shown vided with sprocket teeth chain drives and thelike.

In the use of my device the parts will normally be positioned as shownin Fig. 1. When the device is being positioned for use ring 13 will berotated around hub 12 so that the teeth on said ring will be set backone tooth further than the teeth 11 and 28,there by moving the pavvls 20into the position shown in Fig. 5. It will then be brought into meshWith its companion gears, which are of the usual type, thereby holdingmembers 10, 13 and 27 in their adjusted positions. Vhen the engine isbeing operated, or the gears rotated, springs 25 will tend to movepavvls 2O to their normal positions, thereby compensating for any Wearof the teeth in any of the gears. While I have shown and described mydevice as being set back one tooth, it will be understood that anydesired my device profor use in silent number of teeth Within its limitsmay be' used.

Having described my invention, What I claim is:

1. A timing gear for explosion engines comprising a disc havingperipheral teeth and a hub extending from one side thereof concentrictherewith a ring rotatably mounted upon said hub having peripheral teethcoinciding with the teeth of said disc; a disc detachably secured uponthe side of said hub having peripheral teeth coinciding with the teethof said ring and said first disc; a pair of notches in the innerperiphery of said ring on opposite sides thereof; a pair of recesses insaid hub in juxtaposition to said Ill() notches; a pavvl pivotallymounted between its ends in each of said recesses to extend radiallyhaving one end in engagement With lits vrespective notch in said ring; aycoil spring mounted in each recess yhav-ing one end connected to theother end of said pavvl andits other end secured to said disc adaptedydisc, concentric therewith; a ring mounted upon the outer periphery ofsaidhu'b having peripheral gear teeth ladapted to coincide with saidfirst .mentioned gear teeth; Va disc detachably secured to! said irs'tmentioned disc 'adapted when positioned for use tohold March, i924.

said ring positioned for use and having peripheral gear teeth `and-avcentra'l Vshaft opening;V the teeth of all of salid members beingadapted to coincide with each other; and

means 'between said irst vdisc and said ring adapted to impart relativerotation between the same-comprising al pair of opposed notches in theinner periphery of said ring;

a pair vofre'ce'ss'es in `said hub coinciding With said notches; a dogpivotally mounted ,interf mediate itsends in each o'f saidrecesses'having one end Vengaging vits respective notch in said ring andmeans engaging the other end of ksaid dogs adapted to rock the same tocause said relative rotation.

In Witness that I claim the ,foregoing I have hereunto set "my handlthis 27th day .of

CLARENCE L. STARKEY.

